X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/ms2-fixes/blobdiff_plain/a24856748de5cf6fde97b2fb27537570d6f9ece1..70f5583bed4af417abe2d5ec5aa78bd4c7d7b80b:/debounce.c

diff --git a/debounce.c b/debounce.c
index f2793a4..45b0140 100644
--- a/debounce.c
+++ b/debounce.c
@@ -2,14 +2,17 @@
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/gpio_event.h>
+#include <mach/gpio.h>
 
 #define PREFIX "debounce: "
 
 static unsigned old_flags = 0;
-ktime_t old_debounce_delay;
-ktime_t old_settle_time;
-ktime_t old_poll_time;
+static ktime_t old_debounce_delay;
+static ktime_t old_settle_time;
+static ktime_t old_poll_time;
 static struct gpio_event_matrix_info *gpio_evmi = NULL;
+static int hw_debounce = 0;
+static int hw_debounce_time = 0;
 
 static int find_ms2_dev(struct device *dev, void *data)
 {
@@ -20,6 +23,29 @@ static int find_ms2_dev(struct device *dev, void *data)
 	return 0;
 }
 
+/* hardware debounce: (time + 1) * 31us */
+static void hw_debounce_set(int enable, int time) {
+	int i;
+
+	if (gpio_evmi == NULL)
+		return;
+
+	for (i = 0; i < gpio_evmi->ninputs; i++) {
+		int gpio = gpio_evmi->input_gpios[i];
+
+		if (enable != -1) {
+			printk(KERN_INFO PREFIX "%sabling hardware debounce for GPIO %d\n", (enable?"En":"Dis"), gpio);
+			omap_set_gpio_debounce(gpio, enable);
+		}
+
+		if ((time != -1) && hw_debounce) {
+			printk(KERN_INFO PREFIX "Setting hardware debounce time for GPIO %d to %d (%dus)\n", gpio, time, (time+1)*31);
+			omap_set_gpio_debounce_time(gpio, time);
+		}
+	}
+}
+
+
 static ssize_t show_debounce_delay(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	if (!gpio_evmi) 
@@ -312,6 +338,49 @@ static ssize_t store_drive_inactive_flag(struct device *dev, struct device_attri
 	return count;
 }
 
+static ssize_t show_hw_debounce(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce);
+}
+
+static ssize_t store_hw_debounce(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+	int enable;
+
+	sscanf(buf, "%d", &enable);
+
+	if (enable) {
+		hw_debounce_set(1, -1);
+		hw_debounce = 1;
+	}
+	else {
+		hw_debounce_set(0, -1);
+		hw_debounce = 0;
+	}
+
+	return count;
+}
+
+static ssize_t show_hw_debounce_time(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce_time);
+}
+
+static ssize_t store_hw_debounce_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+	int time;
+
+	sscanf(buf, "%d", &time);
+
+	if ((time < 0) || (time > 0xff))
+		return count;
+
+	hw_debounce_set(-1, time);
+	hw_debounce_time = time;
+
+	return count;
+}
+
 static DEVICE_ATTR(debounce_delay, (S_IRUGO | S_IWUGO), show_debounce_delay, store_debounce_delay);
 static DEVICE_ATTR(settle_time, (S_IRUGO | S_IWUGO), show_settle_time, store_settle_time);
 static DEVICE_ATTR(poll_time, (S_IRUGO | S_IWUGO), show_poll_time, store_poll_time);
@@ -323,6 +392,8 @@ static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_mappe
 static DEVICE_ATTR(print_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_print_phantom_keys_flag, store_print_phantom_keys_flag);
 static DEVICE_ATTR(active_high_flag, (S_IRUGO), show_active_high_flag, store_active_high_flag);
 static DEVICE_ATTR(drive_inactive_flag, (S_IRUGO | S_IWUGO), show_drive_inactive_flag, store_drive_inactive_flag);
+static DEVICE_ATTR(hw_debounce, (S_IRUGO | S_IWUGO), show_hw_debounce, store_hw_debounce);
+static DEVICE_ATTR(hw_debounce_time, (S_IRUGO | S_IWUGO), show_hw_debounce_time, store_hw_debounce_time);
 
 static void debounce_release(struct device *dev)
 {
@@ -370,6 +441,8 @@ static int __init debounce_init(void)
 	err = device_create_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
 	err = device_create_file(&debounce_device, &dev_attr_active_high_flag);
 	err = device_create_file(&debounce_device, &dev_attr_drive_inactive_flag);
+	err = device_create_file(&debounce_device, &dev_attr_hw_debounce);
+	err = device_create_file(&debounce_device, &dev_attr_hw_debounce_time);
 
 	printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec);
 	printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec);
@@ -402,6 +475,7 @@ static void __exit debounce_exit(void)
 		gpio_evmi->settle_time = old_settle_time;
 		gpio_evmi->poll_time = old_poll_time;
 	}
+	hw_debounce_set(0, 0);
 	device_remove_file(&debounce_device, &dev_attr_debounce_delay);
 	device_remove_file(&debounce_device, &dev_attr_settle_time);
 	device_remove_file(&debounce_device, &dev_attr_poll_time);
@@ -413,6 +487,8 @@ static void __exit debounce_exit(void)
 	device_remove_file(&debounce_device, &dev_attr_print_phantom_keys_flag);
 	device_remove_file(&debounce_device, &dev_attr_active_high_flag);
 	device_remove_file(&debounce_device, &dev_attr_drive_inactive_flag);
+	device_remove_file(&debounce_device, &dev_attr_hw_debounce);
+	device_remove_file(&debounce_device, &dev_attr_hw_debounce_time);
 	device_unregister(&debounce_device);
 }